Partially Fluorinated Aarylene Polyethers and their Ternary Blends with PBI and H₃PO₄. Part II. Characterisation and Fuel Cell Tests of the Ternary Membranes

Abstract

Due to an unfortunate mistake, the publishers regret that Fig. 7 on p.196 of the above article was incorrect. The correct figure is shown below.The editorial team apologizes for any inconvenience this may have caused. PBI-1b, ADL=11, RH=10% Fig.7 Proton conductivity of acid doped PBI and PBI-1b blend membranes as a function of temperature. As a comparison, data for 100% phosphoric acid and Nafion 117 are also included. The PPA-cast membrane was with an acid doping level of 32 and at relative humidity of 0% [20]; The DMAc-cast membrane was with an acid doping level of 5.7 and under atmosphere with a water-to-air ratio of about 0.7 [6]; The TFA membrane was with an acid doping level of 6.0 and at relative humidity of 5% [7]. MISCELLANEOUS 374

Pyridine‐based PBI Composite Membranes for PEMFCs

“…This is due to the high proton conductivity with no or low humidification, promising fuel cell performance, and low methanol permeability which makes possible their use in direct methanol fuel cells (DMFC), beside that in the more standard H 2 /O 2 cells [3][4][5][6][7]. At present, however, the PBIbased fuel cells have some technological limitations: (i) bad mechanical properties due to the high acid doping levels; (ii) catalyst particle agglomeration, (iii) possible leaching of the free acid under operating conditions.…”

Sulfonated poly(arylene thioether phosphine oxide)s and poly(arylene ether phosphine oxide)s PBI-blend membranes and their performance in SO2 electrolysis

“…It has been demonstrated that PBI based high-T membranes, comprising of PBI-excess acid-base blend membranes from different PBI types (PBI Celazol, F 6 PBI, PBIOO) with sulfonated [14,15] or phosphonated [16] polymers as acidic blend components, can be doped with phosphoric acid making them suitable for the application in high-T fuel cells in the T range 100e200 C. In addition, it was shown that unlike pure PBI base-excess blend membranes, PBI acid-base blend membranes do not dissolve in hot phosphoric acid due to the ionical cross-links between the basic and acidic blend components [17]. Moreover, PBIexcess acid-base blend membranes show higher chemical and thermal stabilities than pure PBI membranes.…”

Fluorinated Siloxane Polymers Formed by Cyclization of Trifluorovinyl Aryl Ethers with Tunable Properties

“…Fluorinated polymers are a special type of polymer that contain carbon–fluorine bonds in the backbone or side chain . Owing to the high electronegativity, low polarizability, and small size of fluorine atom, as well as the ultrahigh C–F bond energy (485 kJ/mol), fluorinated polymers exhibit exceptional thermal stability, chemical resistance, water and oil repellency, and other unique properties. − Fluorinated olefin polymers, such as polytetrafluoroethylene, polyvinylidene fluoride, polychlorotrifluoroethylene, etc., have been synthesized and commercialized, which meet tremendous applications in chemical/petrochemical, electrical/electronic, aeronautics/astronautics, and watercraft/automotive industry. − According to rigorous applications and processing limitations, the copolymerization of fluorinated olefin monomers was explored, and copolymers with comprehensive performance have been produced, such as fluorinated ethylene propylene, polyfluoroalkoxy, ethylene-terafluoroethlene, and ethylene-chlorotrifluoroethylene. − The properties of fluorinated polymers can be further tuned by adjusting the structure or proportion of monomers. , Besides traditional fluorinated olefin materials, fluorination has been used to improve the performance of other types of polymers, such as polyurethanes, polyimide, polyether, acrylate polymers, etc. − …”